The Wireless Mesh Network (WMN) is a new type of wireless communication network. It consists of wireless routers and terminal units, which are connected by wireless links. WMN possesses the merits of Wireless Local Area Network (WLAN) and Wireless Ad-hoc Network. It is a multipoint to multipoint network with high capacity and high transmission rate.Dynamic source routing protocol (DSR) is a most important protocol of WMN. A source node floods a Route Request (RREQ) when it has a packet to send but has no route to the destination node in the route discovery phase, this increases the cost and delay.In this paper, in order to reduce cost a small scale seeking is presented by using route caching.Firstly, basing on the research of the main protocol-DSR, the improvement on DSR is proposed. A new method to measure the usefulness probability of route cache is presented. This method makes the quality of route as a key element except for the conventional factors influencing the usefulness probability of route. In accordance with the probability, whether or not returning a route cache in response can be decided, this method can reduce invalidation routes to avoid losing packets.Secondly, a new routing strategy is designed that adapts to the current received RREQ and RREP situation to adjust seeking radius instead of flooding in whole network for reducing cost. It takes the position in route of node sending RREP into account to ensure finding route.Thirdly, the improvement DSR routing protocol using route cache to implement a small scale seeking is designed, CS-DSR is the abbreviation of the protocol. Then packet formats, data structures and detailed operations are described in detail.Finally, simulation results show that CS-DSR all outperform DSR in routing cost, delay and throughput.
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